Vehicle speed sensor VAZ 2109

For the correct operation of many car systems, a prerequisite is the presence of miniature devices operating in automatic mode. If such a sensor fails, the efficiency of the internal combustion engine, as well as the comfort and safety of driving a vehicle, may decrease. A device for determining the speed of a car is one of the most important elements of a modern car.

What is a speed sensor for?

The VAZ 2109 vehicle speed sensor is necessary to transmit information about the rotation speed of transmission elements directly connected to the drive wheels. Unlike determining engine speed, reading the gauges in this torque section allows you to calculate the actual speed of the machine.

Determination of the main parameter of the car's movement allows not only to avoid penalties for exceeding the maximum possible speed, but also to significantly increase the stability of the engine, some systems of which may depend on obtaining reliable information from sensors of this type.

Symptoms of a malfunction

If the speedometer needle remains stationary regardless of the speed of the vehicle, then this symptom is most characteristic of this type of problem. A malfunction of the element can also significantly affect the readings of the odometer, which either stops counting the kilometers traveled altogether, or its operation becomes unstable. Problems with the "arrow" can also be observed from time to time. In such a situation, the speed sensor is not always to blame. So often there is insufficient contact of the wires connected to the terminals.

If a signal is also received from the sensor to the engine ECU, then the symptoms of a malfunction of this part may manifest itself in the form of unstable operation of the power unit. Engine failures will be especially noticeable during hard acceleration. Increased fuel consumption and unstable engine operation when driving at low speed are also possible. Difficulty starting the engine and idling it can also be a sign of a malfunction of the VAZ 2109 DS.

Where is

If you plan to change a faulty part with your own hands, then first of all you need to find out where such elements are located on domestic cars of the VAZ family. You can find the registration of part of the axle speed in the immediate vicinity of these elements of the car. This item is on the gearbox next to the right grenade.

To perform diagnostic operations or replace the nozzle of the VAZ 2109 vehicle speed sensor, access to it is possible from the side of the engine compartment or from the bottom of the car. The first option is more convenient and requires less effort and time to prepare the car. For the second method of repair, you will need to install the car on a gazebo, overpass or raise the car on a lift.

Replacing the speed sensor

Replacing the speed sensor with a new product is the most optimal solution to the problem of a speedometer that does not take into account the speed and causes of unstable engine operation. To restore the machine to its previous state after installing DS, you need to purchase a quality product. The VAZ 2109 speed sensor can be purchased both in regular retail stores and on the Internet, therefore, when it is not possible to check the product before buying, you should rely only on real customer reviews from the online store.

Having found out where the DS VAZ 2109 is located and having bought a high-quality spare part, you can proceed to the operation of installing a new product. This simple operation is performed in the following sequence:

• Open the hood.
• Disconnect the negative battery terminal.
• Carefully remove the connector from the cable connected to the sensor.
• Unscrew the faulty sensor.
• Install a new sensor.
• Connect the cables to DC and the negative terminal to the battery.

On this, the replacement of the DS VAZ 2109 can be considered complete. If everything was done according to the instructions, then after installing the new part, the car's speedometer will work fine. It is recommended to check the performance of the speed detection system in various vehicle driving modes.

Tips and Tricks

Despite the ease of operation, even experienced craftsmen may encounter some problems when installing and connecting the sensor. For example, if the wires leading to the part accidentally break, they will need to be connected correctly. To do this, you need to know the pinout of the VAZ 2109 speed sensor.

Negative and positive contacts are transmitted through the wires, and a wire transmitting pulses is connected to the receiving device. A designation is applied to the block, by which it is possible to judge whether the cables belong to one or another type. Connectors can be displayed with the following numeric or alphanumeric codes:

• "1", "2", "3".
• "-", "A", "+".

In addition to the correct connection of the VAZ 2109 DS, you may need to reset the on-board computer error. If this is not done, even if there is a working part, automation may show a problem.

To facilitate the process of replacing the speed sensor on vehicles of the VAZ family equipped with injection engines, it is recommended to disassemble the adsorbent before carrying out work. This device is in the path of access to the vehicle's DS. The operation will not take much time, but the replacement of the main part will be more comfortable and safer.